Cowbell Glass BOD BOTTLES, Color : Transparent

“Cowbell” bottle is normally designed to have a special shoulder radius to push out all air from the inside of the bottle when a sample solution is being filled into the bottle. According to the EPA Standard Methods for the Examination of Water and Wastewater or the Standard Methods 5210,[1] the BOD bottle should include a ground-glass stopper and a flared mouth which form a water seal preventing the air from the outside of the bottle coming in.